And how do you burn witches?

Bedevere: And how do you burn witches?
Crowd: With more witches!
Bedevere: No,no,no…And why do witches burn?
Peasant: Because…there made…of…wood?
Bedevere: Precisely, so how do we know if she’s made fo wood?
Peasant: Biuld a bridge out of her!
Bedevere: Ah, but can you also not build a bridge out of stone?